Playing around with the idea of overriding clojure's error messages with custom messages for child safety and/or text localization. Maybe scanning the clojure source for error messages creating a catalog of them at first, later automatically manipulating the source.

I know it's a lost cause because many errors boil down to Java error messages

But yet, any library that is a good fit to use for scanning clojure code at scale, short of directly rolling my own bare-handed code? I've done similar things for Scala before, so this might actually go some humble distance.

High level motivation case in point: a null pointer exception is not a good error indication for when someone places a non-fn var in call position.

There is actually a university that has a project that has spent a lot of time on custom Clojure messages for beginners

https://m.youtube.com/watch?v=k5erDyDPzgc

They have even done some research studies (which Cognitect helped fund). I don't know if that project is publicly available though.